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Journal of Hand Surgery (British and European Volume)
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Articles

Changes in Carpal Tunnel Shape During Wrist Joint Motion

MRI evaluation of normal volunteers

S. YOSHIOKA
Y. OKUDA
K. TAMAI
Y. HIRASAWA
Y. KODA

From the Department of Orthopedic Surgery, Kyoto Prefectural University of Medicine and the Department of Radiology, Matsushita Memorial Hospital, Japan

Correspondence: Shinji Yoshioka, MD, Department of Orthopedic Surgery, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602, Japan.

This study evaluated dynamically the morphology of the carpal tunnel during the wrist motion. The object was to determine the transverse dimension (TD), anteroposterior(AP) dimension and cross-sectional area (CA) of the carpal tunnel in the neutral, flexed and extended positions. The wrists of eight male and eight female volunteers aged 20 to 38 years were studied.

With wrist extension, AP and CA decreased while the TD increased at the pisiform level, and CA increased at the hamate level. With flexion, TD and CA decreased at the pisiform level and CA decreased at the hamate level. The results showed that the median nerve may be subjected to significant pressure at the pisiform level when the wrist is extended. During wrist flexion, the cross-sectional area decreased at both the level of the pisiform and the hook of the hamate.

Journal of Hand Surgery (British and European Volume), Vol. 18, No. 5, 620-623 (1993)
DOI: 10.1016/0266-7681(93)90018-B
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